You mention you've customized postreview ...
is it possible that your new code has the Unicode assumption in
it rather than the original RBtools.

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I don't think so, the relevant line of code looks like this:

return content_type, content

The trace back does not appear to show that line of code. There appears
to be a concatenation of unicode and (2.x) str (bytes) type.

This may well be "fixed" by trying python 2.6 (or even 2.5) as you
suggested. You'd need to debug this through to see where the Unicode
string is coming from, 2.7 is the cross over version for 2.x and 3 and
it does try to deal with Unicode types when possible. Of course json
data is supposed to be utf8 encoded so this maybe where this is failing
down.